Abstract
The aim of the work was to investigate oxygen consumption, ammonia excretion, O:N ratio derived from oxygen consumption and ammonia excretion, and the clearance rate of the bearded horse mussel Modiolusbarbatus(Linnaeus, 1758) and the Noah's Ark shell ArcanoaeLinnaeus, 1758with regard to different food availability (100%, 50% and starving) during a fifteen day experiment. In this study, food quantity significantly affected ammonia excretion and O:N ratio for both species. Time spent under feeding regime resulted to increasing oxygen consumption and clearance rate values of the bearded horse mussel and the ammonia excretion values and O:N ratios of both species. Clearance rate and ammonia excretion followed a similar increasing trend over time. The consequence of increasing ammonia excretion over time was the concomitant reduction of the O:Nratio.Both species showed high values of clearance rate, an important information when choosing the farming site. Metabolic cost of respiration for starving animals was higher for M. barbatus than for A. noae, which suggests that A. noae would be a better choice for farming in oligotrophic environments.
Highlights
The aim of the work was to investigate oxygen consumption, ammonia excretion, O:N ratio derived from oxygen consumption and ammonia excretion, and the clearance rate of the bearded horse mussel Modiolusbarbatus(Linnaeus, 1758) and the Noah's Ark shell
Time spent under feeding regime resulted to increasing oxygen consumption and clearance rate values of the bearded horse mussel and the ammonia excretion values and O:N ratios of both species
The values of ammonia excretion (AE) in this research were consistent with the results reported in some studies (Khalil, 1994; Guzmán-Agüero et al, 2013), but much lower values were documented as well (Hawkins et al, 1985; Stead and Thompson, 2003)
Summary
The aim of the work was to investigate oxygen consumption, ammonia excretion, O:N ratio derived from oxygen consumption and ammonia excretion, and the clearance rate of the bearded horse mussel Modiolusbarbatus(Linnaeus, 1758) and the Noah's Ark shell. Time spent under feeding regime resulted to increasing oxygen consumption and clearance rate values of the bearded horse mussel and the ammonia excretion values and O:N ratios of both species. The aim of this paper was to investigate physiological responses of oxygen consumption (OC), ammonia excretion (AE) and the clearance rate (CR) for M. barbatus and A. noae, reared at different feeding regimes, including food deprivation.
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